Island



(No Model.)

Patented Dec. 27, I898.

W. G. BURNHAM 81. J. PARKER.

' SCREW MACHINE.

(Application filed. Jan. 29, 1898.)

3 Sheets-Sheet l.

VIIIIIIIIIIIIIIIIIIIIIIIIIJ WlTN EESEE j r Q, 4. 6am

Patented Dec. 27, I898.

W. G. BURNHAM &. J. PARKER.

SCREW MACHINE.

(Apphcshon filed Jan 29 1898 3 Sheets-Sheet 2.

(No Model.)

1 1 .will

NVENTDFKS lll /fi///////////////%//// A No. 6l6,654. Patented Dec. 27,I898. W. G. BURNHAM &. J. PARKER.

SCREW MACHINE.

(Application filed Jan. 29, 1898.) (N0 Mudel.) I 3 Shegts-Sheet 3.

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iinrrnn STATES PATENT OFFICE.

XVILLIAM G. BURNHAM AND JOHN PARKER, OF PROVIDENCE, RHODE ISLAND,ASSIGNORS TO THE BROYVN '& SHARPE MANUFACTURING COMPANY, OF SAME PLACE.

SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent No. 616,654, dated December27, 1898. Application filed January 29, 1898. Serial No. 668,386. (Nomodel.)

To all whom it may concern:

Be it known that we, WILLIAM G. BURN- HAM and J OHN PARKER, of the cityand county of Providence, in the State of Rhode Island, have inventedcertain new and useful Improvements in Screw-Machines; and we do herebydeclare the following specification, taken in connection with theaccompanying drawings, forming a part of the same, to be a full, clear,and exact description thereof.

The invention relates to that class of machines in which a series oftools are carried by a turret mounted on a turret-slide, the turretbeing given a partial revolution or indexed after each forward movementof the slide to bring the tools successively into position to operateupon the stock, which is held and revolved by means of a chuck.

One objectof the invention is to provide simple and etficieut means forautomatically clamping the turret after it has been indexed, so that theturret will be rigidly held in position during the cutting operation ofthe tools carried thereby.

A further object of the invention is to provide a machine in which theturret is automatically clamped and in which the distance through whichthe turret-slide travels may be widely varied, thus permitting the toolsto act through a long or short distance and also enabling the machine toact upon long and short articles without undue lost time in bringing thetools up to the work.

The improvements may be applied to machines in which the turret-slide isautomatically reciprocated or to machines in which said slide ismanually operated or to machines in which the slide is operatedpartially by power and partially by hand.

In the accompanying drawings so much of a screw-machine or turret-latheis shown as is necessary to illustrate one embodiment of the presentimprovements.

In said drawings, Figure 1 is a central sectional view showing the meansfor clamping the turret. Fig. 2 is an end View of the adj ustable blockcarrying the stops for operating the indexing mechanism and locking-pinand the cam for operating the clamp. Fig. 3 is a sectional view showingthe means for operating the locking-pin. Fig. 4- is a sectionalelevation showing the indexing mechanism, and Fig. 5 is a sectional planview.

Referring to the drawings, the turret 1 is provided with a dependingshank or post 2, having a conical bearing-surface which is journaled ina conical bearing 3, formed in the turret-slide I. The bottom 5 of theturret seats upon the turret-slide at 6, as is usual.

The pivot shank or post 2 extends below the bearing 3 and has securedthereto, just below the end of the bearing, a collar or flange 7, whichis held against a shoulder 8, formed on the post by means of a nut 9 onthe end of the post and an interposed washer 10. The turret is providedwith openings or sockets 11 for carrying a series of tools, and saidturret may be given a partial revolution to bring the tools successivelyinto operative position by any suitable mechanism. In the form shown theindexing mechanism is as follows: The flange 7 is provided with a seriesof ratchet-teeth corresponding in number to the number of toolsockets inthe turret, and said teeth are engaged by a spring-pressed pawl 11,pivoted on a pawl-carrying disk 12. The disk 12 is loosely pivoted onthe bushing 10 and is held between the flange '7 and the nut 9. Thepawl-disk is oscillated by a bar 13, which is mounted in theturret-slide and is connected to the pawl-disk by means of the pivot-pinof the pawl, which extends into-a transverse slot in the bar, as shownin dotted lines in Fig. 5. A spring 14 acts to hold the bar 13retracted,

and said bar is operated to move the turreta partial revolution by meansto be described.

The turret is locked in position after each indexing by means of alocking-bolt 15,which engages one of a series of holes 16 in the turret.The locking-bolt may be operated at the proper time by any suitablemechanism; but it is preferred to use substantially the mechanism shown.As shown, the bolt is forced toward the turret and is held in engagementwith one of the holes 16 by alever l7, pivoted to the turret-slide at 18and acted on by a spring-pressed pin 19. The lever is rocked to withdrawthe pin by means of a dog 20,

. scribed.

In order that the tools may be rigidly held during the cuttingoperation, means are provided for clamping the turret to theturretslide, and to save time and inconvenience to the operator it ispreferred to operate this clamping means automatically, the turret beingclamped after each indexing and before the cutting begins. The form ofclamping device which is preferably used consists of a wedge which isforced between a shoulder connected with the turret and a fixedabutment, and thus rigidly connects the turret and turret-slide. In theform shown this wedge consists of a U-shaped piece 24, which straddlesthe pivot-post 2. The lower surface of the wedge rests on the flange 7,and the upper inclined surface engages inclined surfaces on the end ofbearing 3, which bearing is cut away on each side of the pivot-post 2.The wedge may be forced between the abutment formed by the end ofbearing 3 and the shoulder on the turret formed by the flange 7 by anysuitable means and will press the turret firmly to its seat and. rigidlyclamp said turret to the turret-slide. It is preferred to operate thewedge by means of a cam mounted on the support on which the turretslidereciprocates, which cam acts to withdraw the bolt as the turret reachesthe indexing position and just before the indexing takes place. In theform shown the wedge is secured to the end of a rod 25, the other end ofwhich is pivoted to one arm 26 of a bellcrank lever 27, pivoted at 28 tothe turretslide. The rod 25 is formed in two parts, one having a rightand the other a left hand thread thereon, which threads are engaged by acoupling-nut 29. By turning this nut the position of the wedge may beadjusted. The other arm 30 of the bell-crank lever is constructed toenter a cam-slot 31, formed in a stationary block 32. As the end 30 ofthe bell-crank lever enters slot 31 the lever is rocked to withdraw thewedge and unclamp the turret, and as the end of said lever leaves saidslot the lever is rocked to advance the wedge and clamp the turret.

In order that the point in the travel of the turret-slide at which theclamping and unclamping are effected may be Varied in acting uponarticles of different lengths, it is preferred to make the means foroperating the turret-clamping means adjustable, and so far as thisfeature of invention is concerned the clamping means may be of anysuitable form. In acting upon articles of different lengths the indexingmechanism and locking-bolt should be operated at different points, andin order that the adjustment of the means for operating these mechanismsand the adjustment of the clamp operating means may be readily effectedit is preferred to mount all of said operating means upon a singleadjustable part. Accordingly with the forms of indexing, locking, andclamping means shown the block 32, in which the cam-slot 31 is formed,also forms a stop-block with which the ends of bars 13 and 22 engage inthe backward movement of the turret-slide. This block is preferablymounted upon the bedways 33 on which the turret-slide is guided, andsaid block is held in adjusted position by bolts 34 and nuts 35. Theblock 32 is provided with stop-pins 36 and 37, which may be adjusted byscrews 38. The turret-slide may be reciprocated by any suitable meanseither manually or automatically. In the drawings a hand-wheel 39 isshown secured to the end of a shaft 40,which carries a pinion 41,engaging a rack 42 on the bed. By turning this wheel the turret-slidemay be moved on the ways in either direction.

The bars 13 and 22 and the lever 27 are so arranged that as theturret-slide is moved back the bar 22 first engages the pin 37, andfurther movement of the slide causes incline 31 to ride over the dog 20,thus withdrawing the locking-bolt. At the same time the end of lever 27enters the cam-slot 31 and the wedge 2; is withdrawn and the turretunclamped. Further movement of the turretslide brings the bar 13 againstthe pin 36 and the indexing mechanism is operated, the locking-pin beingheld withdrawn by the dog 20, which engages the straight portion 43 onlever 17. As the indexing is completed the recess 44 arrives over dog 20and the locking-bolt is projected into one of the holes 16 and locks theturret. When the turret-slide starts forward, the dog 20 tips on itspivot to allow the end of lever 17 to pass, and as the lever 27 leavesthe cam-slot 31 the wedge is forced forward to clamp the turret.

The block 32 may be adjusted along the bed so that the backward movementof the turret-slide after a tool has been disengaged from the stock needonly be sufficient to operate the locking-bolt, clamp, and indexingmechanism. Moreover, since the turret-slide is mounted on ways formed onthe frame instead of upon an adjustable bed the length of travel of theslide may be more widely varied.

What we claim as our invention, and desire to secure by Letters Patent,is-

1. The combination witha support, ofa turret-slide mounted toreciprocate thereon, a turret on said slide, means for clamping saidturret to said slide, and means adj ustably mounted on said support foroperating said clamping means, substantially asdescribed.

2. The combination with a support provided with ways, a turret-slidemounted to reciprocate on said ways, a turret on said slide, means forclamping said turret to said slide,

and a block adjustably mounted on said support and provided with a camfor operating said clamping means, substantially as described.

3. The combination with a support provided with ways, a turret-slidemounted to reciprocate on said ways, a turret on said slide, mechanismfor indexing said turret, means for clamping said turret, and anadjustable stopblock mounted on said support for operating the indexingmechanism and provided with a cam for operating the clamping means,substantially as described.

a. The combination with a support provided with ways, a turret-slidemounted to reciprocate on said ways, a turret on said slide, means forindexing and locking said turret, an adjustable stop-block for operatingsaid means, means for clamping said turret to said slide, and meanscarried by said stop-block for operating said clamping means,substantially as described.

5. The combination with a turret, of means for clamping the samecomprising a shoulder, a fixed abutment, a wedge between said abutmentand shoulder, and means for operating said wedge to clamp the turret,substantially as describled.

(3. The combination with a turret-slide, of a turret mounted thereon, anabutment on said slide, a shoulder connected with said tur ret, a wedgebetween said abutment and shoulder operated by the movement of theturretslide to clamp the turret to said slide, substantially asdescribed.

7. The combination with a support provided with ways, a turret-slidemounted to reciprocate on said ways, a turret on said slide, an abutmenton the slide, a shoulder connected with the turret, a wedge between saidshoulder and abutment, and a cam mounted on the support for operatingsaid wedge, substantially as described.

8. The combination with a turret-slide, of a turret mounted thereon, anabutment on said slide, a shoulder connected with said turret, a wedgebetween said abutment and shoulder, mechanism for indexing said turret,and means for automatically operating said wedge to clamp said turretafter each indexing, substantially as described.

9. The combination with a turret-slide, of a turret mounted thereon, anabutment on said slide, a shoulder connected with said turret, a wedgebetween said abutment and shoulder, and means for automaticallyoperating said wedge to clamp and unclamp said turret, substantially asdescribed.

10. The combination with a turret-slide, of a turret thereon, anabutment on said slide, a shoulder connected with said turret, a wedgebetween said shoulder and abutment, and a stationary cam on said supportfor operating said wedge, substantially as described.

11. The combination with a turret-slide, of a turret thereon, anabutment on said slide, a shoulder connected with said turret, a wedgebetween said abutment and shoulder, and an adjustable stationary cam foroperating said wedge, substantially as described.

12. The combination with a turret, of a flange thereon, a clampingdevice engaging said flange, and means for automatically operating saidclamping device to clamp and unclamp said turret, substantially asdescribed.

13. The combination with a turret-slide, of a turret provided with aprojecting post journaled in said slide, a flange on said post, clampingdevice engaging said flange, and means for automatically operating saiddevice, substantially as described.

ll. The combination with aturret-slide, of a turret provided with adepending pivotpost, a flange 011 the lower end of said post, a wedgebetween said flange and anabutment on said slide, and means forautomatically operating said wedge, substantially as described.

WILLIAM G. BURNHAM. JOHN PARKER. \Vitnesses:

R. A. Burns, IRA L. FIsH.

